CN110592475A - Large-size high-carbon silicon-manganese steel and manufacturing method thereof - Google Patents
Large-size high-carbon silicon-manganese steel and manufacturing method thereof Download PDFInfo
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Abstract
The invention discloses a large-size high-carbon silicon-manganese steel and a manufacturing method thereof, wherein the high-carbon silicon-manganese steel comprises the following components in percentage by mass: 0.60 to 1.20 wt%, Si: 0.38-0.80 wt%, Mn: 1.00-1.90 wt%, P: less than or equal to 0.020 wt%, S: less than or equal to 0.005 wt%, Al: 0.02-0.06 wt%, Nb: 0.020 to 0.050 wt%, Ti: 0.01 to 0.04 wt%, V: 0.025 to 0.065 wt%, Cr: 0.08 to 0.31 wt%, Mo: 0.10 to 0.50 wt%, and the balance of Fe and inevitable impurities. The technical problem that the center quality of large-size high-carbon silicon-manganese steel produced in the prior art is poor is solved, continuous casting production of the large-size high-carbon silicon-manganese steel is realized, shrinkage cavities in continuous casting billets are successfully welded, internal porosity is greatly improved, low-power central porosity, general porosity and ingot type segregation of the large-size high-carbon silicon-manganese steel are less than or equal to 1.5 grade, the defects of residual shrinkage cavities and cracks do not exist in the low-power cross section, and the flaw detection qualification rate reaches over 95%.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to large-size high-carbon silicon-manganese steel and a manufacturing method thereof.
Background
The high-carbon silicon manganese steel mainly refers to steel with C content of above 0.6% and high Si and Mn content, such as 8MnSi and 6CrMnSi2Mo, etc. The steel grades generally have high contents of elements such as C, Si, Mn and the like, are easy to segregate in the continuous casting process, and the solidification shrinkage of high alloy steel is large, so that the difficulty in controlling segregation, shrinkage cavity and porosity in the casting blank is high for producing the continuous casting blank with a large section, and the development of large-scale high-carbon silicon manganese steel is limited. Generally, large-size (200 mm or more) high-carbon silicon manganese steel is produced by rolling die-cast steel ingots, the shrinkage and the loosening of the steel ingots are well controlled, the internal quality assurance capability is stronger, but the production efficiency and the yield are low, so that the production cost is greatly increased, and the popularization and the application in industrial production are difficult. The existing method for producing large-size high-carbon silicon manganese still needs to solve the problem urgently.
Because the prior art is limited by the production capacity of large sections of continuous casting billets, the defects of shrinkage cavities and looseness inside the continuous casting billets cannot be effectively welded due to small rolling, and the technical problem that the center quality of the produced large-specification high-carbon silicon manganese steel is poor is caused.
Disclosure of Invention
The embodiment of the invention provides large-size high-carbon silicon-manganese steel and a manufacturing method thereof, which are used for solving the technical problem that the quality of the center of the produced large-size high-carbon silicon-manganese steel is poor due to the fact that rolling is small and the defects of shrinkage cavities and porosity in the continuous casting billet cannot be effectively welded because of the limited production capacity of the large section of the continuous casting billet in the prior art, realizing continuous casting production of the large-size high-carbon silicon-manganese steel, successfully welding the shrinkage cavities in the continuous casting billet, greatly improving the internal porosity, enabling the low-power central porosity, the general porosity and ingot type segregation of the large-size high-carbon silicon-manganese steel to be less than or equal to 1.5 grade, avoiding the defects of residual shrinkage cavities and cracks in the low-power cross section and achieving the flaw detection qualification rate of more.
In order to solve the above problem, in a first aspect, an embodiment of the present invention provides a large-specification high-carbon silicon-manganese steel, where the high-carbon silicon-manganese steel includes, by mass, C: 0.60 to 1.20 wt%, Si: 0.38-0.80 wt%, Mn: 1.00-1.90 wt%, P: less than or equal to 0.020 wt%, S: less than or equal to 0.005 wt%, Al: 0.02-0.06 wt%, Nb: 0.020 to 0.050 wt%, Ti: 0.01 to 0.04 wt%, V: 0.025 to 0.065 wt%, Cr: 0.08 to 0.31 wt%, Mo: 0.10 to 0.50 wt%, and the balance of Fe and inevitable impurities.
Preferably, the high-carbon silicon manganese steel comprises a part of components in percentage by mass as follows: 0.80-1.20 wt%, Si: 0.50-0.80 wt%, Mn: 1.00-1.50 wt%, Cr: 0.15 to 0.30 wt%, Mo: 0.10 to 0.35 weight percent.
Preferably, the high-carbon silicon manganese steel comprises a part of components in percentage by mass as follows: 0.65-1.00 wt%, Si: 0.40-0.65 wt%, Mn: 1.15-1.45 wt%, Cr: 0.10 to 0.28 wt%, Mo: 0.18 to 0.40 weight percent.
Preferably, the high-carbon silicon manganese steel comprises a part of components in percentage by mass as follows: 0.84-1.15 wt%, Si: 0.52 to 0.78 wt%, Mn: 1.20-1.90 wt%, Cr: 0.08 to 0.20 wt%, Mo: 0.12 to 0.42 weight percent.
In a second aspect, the embodiment of the invention provides a method for manufacturing large-size high-carbon silicon-manganese steel, the method comprises the steps of pouring molten steel in a steel ladle into a tundish in a protected manner, enabling the molten steel in the tundish to enter a crystallizer, and electromagnetically stirring the molten steel by using the crystallizer, a casting flow and a tail end in a combined manner to obtain a continuous casting blank, wherein the continuous casting blank comprises the following components in percentage by mass: 0.60 to 1.20 wt%, Si: 0.38-0.80 wt%, Mn: 1.00-1.90 wt%, P: less than or equal to 0.020 wt%, S: less than or equal to 0.005 wt%, Al: 0.02-0.06 wt%, Nb: 0.020 to 0.050 wt%, Ti: 0.01 to 0.04 wt%, V: 0.025 to 0.065 wt%, Cr: 0.08 to 0.31 wt%, Mo: 0.10 to 0.50 weight percent, and the balance of Fe and inevitable impurities; conveying the continuous casting blank to a heating furnace in a hot charging and hot conveying manner for heating, wherein the temperature of the continuous casting blank is 1200-1250 ℃ after heating is finished, and the heat preservation time is 5-8 h; rolling the heated continuous casting plate blank by using a cogging mill to obtain square steel, and obtaining large-size high-carbon silicon-manganese steel by using 4-6 continuous rolling mill sets for the square steel; and (3) performing high-temperature pit entry and slow cooling on the large-size high-carbon silicon manganese steel after rolling, wherein the pit entry temperature is 650-720 ℃, and the pit exit temperature is 25-150 ℃.
Preferably, the tundish is provided with a double-layer protective agent.
Preferably, the electromagnetic stirring current range of the crystallizer is 100-400A, and the frequency is 1-5 Hz.
Preferably, the electromagnetic stirring current range of the tail end is 800-1500A, and the frequency is 5-12 Hz.
Preferably, the electromagnetic stirring of the molten steel using the combined crystallizer, casting flow and end to obtain a continuous casting billet comprises: pouring the molten steel stirred in the crystallizer by adopting a low superheat degree to obtain molten steel of a solidified shell; and regulating and controlling the throwing speed and the secondary cooling water specific water amount of the molten steel of the solidified blank shell to obtain the continuous casting blank.
Preferably, the low superheat pouring temperature is 20-30 ℃.
Preferably, the blank drawing speed is 0.2-0.7 m/min.
Preferably, the specific water amount of the secondary cooling water is 0.5-1.0L/kg.
Preferably, the continuous casting slab is a large-section continuous casting slab, wherein the specification of the continuous casting slab is phi is more than or equal to 600 mm.
Preferably, the continuous casting billet is conveyed to a heating furnace at the hot charging temperature of 550-600 ℃.
Preferably, the heating of the continuous casting billet by hot charging and hot feeding conveying to a heating furnace comprises: the continuous casting billet is heated and divided into a preheating section, a first heating section, a second heating section and a soaking section, wherein the temperature of the preheating section is controlled to be 800-1000 ℃, the temperature of the first heating section is controlled to be 1001-1150 ℃, the temperature of the second heating section is controlled to be 1151-1220 ℃, and the temperature of the soaking section is controlled to be 1200-1250 ℃.
Preferably, the total heating time of the continuous casting billet is 12-16 h.
Preferably, the heat preservation time of the heating second section is 5-8 h.
Preferably, the heated continuous casting slab is rolled by a cogging mill in an intermediate pass by using a 3-4 pass rolling reduction of 110-130 mm to obtain square steel.
Preferably, the specification of the square steel is 270 x 270-430 x 430 mm.
Preferably, the large-specification high-carbon silicon-manganese steel is round steel.
Preferably, the slow cooling time for performing high-temperature pit entering and slow cooling on the large-size high-carbon silicon-manganese steel after rolling is 72-96 hours.
One or more technical solutions in the embodiments of the present invention at least have one or more of the following technical effects:
the embodiment of the invention provides large-size high-carbon silicon-manganese steel and a manufacturing method thereof, wherein molten steel in a steel ladle is poured into a tundish in a protective mode, the molten steel in the tundish enters a crystallizer, the molten steel is electromagnetically stirred by the crystallizer, a casting flow and a tail end in a combined mode to obtain a continuous casting blank, and the continuous casting blank comprises the following components in percentage by mass: 0.60 to 1.20 wt%, Si: 0.38-0.80 wt%, Mn: 1.00-1.90 wt%, P: less than or equal to 0.020 wt%, S: less than or equal to 0.005 wt%, Al: 0.02-0.06 wt%, Nb: 0.020 to 0.050 wt%, Ti: 0.01 to 0.04 wt%, V: 0.025 to 0.065 wt%, Cr: 0.08 to 0.31 wt%, Mo: 0.10 to 0.50 weight percent, and the balance of Fe and inevitable impurities; conveying the continuous casting blank to a heating furnace in a hot charging and hot conveying manner for heating, wherein the temperature of the continuous casting blank is 1200-1250 ℃ after heating is finished, and the heat preservation time is 5-8 h; rolling the heated continuous casting plate blank by using a cogging mill to obtain square steel, and obtaining large-size high-carbon silicon-manganese steel by using 4-6 continuous rolling mill sets for the square steel; and (3) performing high-temperature pit entry and slow cooling on the large-size high-carbon silicon manganese steel after rolling, wherein the pit entry temperature is 650-720 ℃, and the pit exit temperature is 25-150 ℃. The technical problem that the quality of the center of the produced large-size high-carbon silicon manganese steel is poor due to the fact that the production capacity of a large section of a continuous casting billet is limited in the prior art and the defects of shrinkage and looseness in the continuous casting billet cannot be effectively welded due to small rolling is solved by adopting a hot charging hot delivery, large rolling reduction of a cogging mill and high-temperature slow cooling, continuous casting production of the large-size high-carbon silicon manganese steel is achieved, the shrinkage in the continuous casting billet is successfully welded, the inner looseness is greatly improved, the low-power central looseness, the general looseness and ingot type segregation of the large-size high-carbon silicon manganese steel are less than or equal to 1.5 grade, the defects of residual shrinkage and cracks do not exist in the low-power cross section, and the qualification rate is over 95%.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
FIG. 1 is a flow chart of a method for manufacturing large-specification high-carbon silicon manganese steel according to an embodiment of the specification.
Detailed Description
The embodiment of the invention provides large-size high-carbon silicon-manganese steel and a manufacturing method thereof, which are used for solving the technical problem that the quality of the center of the produced large-size high-carbon silicon-manganese steel is poor due to the fact that rolling is small and the defects of shrinkage cavities and porosity in the continuous casting billet cannot be effectively welded because of the limited production capacity of the large section of the continuous casting billet in the prior art, realizing continuous casting production of the large-size high-carbon silicon-manganese steel, successfully welding the shrinkage cavities in the continuous casting billet, greatly improving the internal porosity, enabling the low-power central porosity, the general porosity and ingot type segregation of the large-size high-carbon silicon-manganese steel to be less than or equal to 1.5 grade, avoiding the defects of residual shrinkage cavities and cracks in the low-power cross section and achieving the flaw detection qualification rate of more.
According to the technical scheme in the embodiment of the invention, the high-carbon silicon-manganese steel comprises the following components in percentage by mass: 0.60 to 1.20 wt%, Si: 0.38-0.80 wt%, Mn: 1.00-1.90 wt%, P: less than or equal to 0.020 wt%, S: less than or equal to 0.005 wt%, Al: 0.02-0.06 wt%, Nb: 0.020 to 0.050 wt%, Ti: 0.01 to 0.04 wt%, V: 0.025 to 0.065 wt%, Cr: 0.08 to 0.31 wt%, Mo: 0.10 to 0.50 wt%, and the balance of Fe and inevitable impurities. The method is used for solving the technical problem that the production capacity of the large section of the continuous casting billet is limited in the prior art, and the defects of shrinkage cavity and porosity in the continuous casting billet cannot be effectively welded due to small rolling, so that the central quality of the produced large-size high-carbon silicon manganese steel is poor, the continuous casting production of the large-size high-carbon silicon manganese steel is realized, the shrinkage cavity in the continuous casting billet is successfully welded, the internal porosity is greatly improved, the low-power central porosity, the general porosity and ingot type segregation of the large-size high-carbon silicon manganese steel are less than or equal to 1.5 grade, the low-power cross section has no defects of residual shrinkage cavity and crack, and the flaw detection qualification rate reaches over 95%.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
The embodiment of the invention provides large-size high-carbon silicon-manganese steel, which comprises the following components in percentage by mass of 0.60-1.20 wt%, Si: 0.38-0.80 wt%, Mn: 1.00-1.90 wt%, P: less than or equal to 0.020 wt%, S: less than or equal to 0.005 wt%, Al: 0.02-0.06 wt%, Nb: 0.020 to 0.050 wt%, Ti: 0.01 to 0.04 wt%, V: 0.025 to 0.065 wt%, Cr: 0.08 to 0.31 wt%, Mo: 0.10 to 0.50 wt%, and the balance of Fe and inevitable impurities.
Further, the high-carbon silicon manganese steel comprises a part of components in percentage by mass as follows: 0.80-1.20 wt%, Si: 0.50-0.80 wt%, Mn: 1.00-1.50 wt%, Cr: 0.15 to 0.30 wt%, Mo: 0.10 to 0.35 weight percent.
Further, the high-carbon silicon manganese steel comprises a part of components in percentage by mass as follows: 0.65-1.00 wt%, Si: 0.40-0.65 wt%, Mn: 1.15-1.45 wt%, Cr: 0.10 to 0.28 wt%, Mo: 0.18 to 0.40 weight percent.
Further, the high-carbon silicon manganese steel comprises a part of components in percentage by mass as follows: 0.84-1.15 wt%, Si: 0.52 to 0.78 wt%, Mn: 1.20-1.90 wt%, Cr: 0.08 to 0.20 wt%, Mo: 0.12 to 0.42 weight percent.
Specifically, C in the components of the high-carbon silicon manganese steel is one of the most economical strengthening elements in the steel. C is favorable for improving the fatigue strength, and when the content of C exceeds 0.03 wt%, the fatigue strength is improved more obviously. The high carbon silicon manganese steel in the present embodiment mainly refers to steel grades having a C content of 0.6% or more and a high Si and Mn content, and therefore, in the high carbon silicon manganese steel in the present embodiment, the mass percentage of C is controlled to 0.60 to 1.20 wt%, and further, Si is a solid solution strengthening element, and ferrite transformation is promoted in the hot rolling process. Comprehensively considered, the mass percent of Si in the high-carbon silicomanganese steel is controlled to be 0.38-0.80 wt%. Mn is a solid solution strengthening element and contributes to increase of the steel strength. However, if the Mn content is too high, a serious band-shaped structure is formed, and the transverse elongation of the steel is lowered, which affects cold formability. In the embodiment of the application, the content of Mn is designed to be 1.00-1.90 wt%. P and S are impurity elements in steel, the P element easily causes the center segregation of steel, the weldability and the plastic toughness of the steel are deteriorated, and the content of the P element is reduced as much as possible; the S element is easy to combine with the Mn element to form MnS inclusion, which can reduce the weldability, the formability, the fatigue property and the low-temperature toughness of the steel, and the content of the S element is reduced as much as possible. In the embodiment of the application, the mass percent of P in the high-carbon silicomanganese steel is controlled to be lower than 0.020 wt%, and the mass percent of S is controlled to be lower than 0.005 wt%. Al acts as a deoxidizer during steel making, and since the cold formability of the material is lowered by incomplete deoxidation, the mass percentage of Al is controlled to be more than 0.02 wt%. However, too high Al content results in too many AlN inclusions in the steel, and the elongation of the steel is lowered. In the embodiment of the application, the mass percent of Al is controlled to be 0.02-0.06 wt%. Nb has the effect of suppressing the recovery of austenite and the grain growth of recrystallization in the hot rolling step, and making the ferrite phase have a desired grain size (2.0 to 6.0 μm). In the embodiment of the application, the Nb content in the high-carbon silicomanganese steel is controlled to be 0.02-0.05 wt%. Ti bonds with C, N in steel at high temperature to form precipitates and serves to suppress austenite grain coarsening during slab heating, but when the amount of Ti added is too large, coarse precipitates are likely to form, which affects the cold formability of the material. In the embodiment of the application, the content of Ti element in the high-carbon silicomanganese steel is controlled to be 0.01-0.04 wt%. V is completely dissolved in a solid solution in a high-temperature austenite region, and is combined with C only in a ferrite region to form carbide precipitation, thereby exerting a strong precipitation strengthening effect. In the embodiment of the application, the content of V in the high-carbon silicomanganese steel is controlled to be 0.025-0.065 wt%. Cr can form a dense oxide film on the surface of the steel sheet to improve the atmospheric corrosion resistance of the steel sheet, but when the Cr content is high, ductility and toughness are lowered. In the embodiment, the Cr content in the high-carbon silicomanganese steel is controlled to be 0.08-0.31 wt%. Mo element can raise hardenability, raise heat strength, prevent tempering brittleness, raise remanence and coercive force, raise corrosion resistance in some medium, prevent pitting corrosion, etc. in steel. In the embodiment, the content of Mo in the high-carbon silicomanganese steel is controlled to be 0.10-0.50 wt%. The balance other than the above components is Fe and inevitable impurities. Preferably, the high-carbon silicon manganese steel may preferably comprise a part of the following components in percentage by mass: 0.80-1.20 wt%, Si: 0.50-0.80 wt%, Mn: 1.00-1.50 wt%, Cr: 0.15 to 0.30 wt%, Mo: 0.10 to 0.35 weight percent. Or, the mass percentage of one part of the high-carbon silicon manganese steel is 0.65-1.00 wt%, and the weight percentage of Si: 0.40-0.65 wt%, Mn: 1.15-1.45 wt%, Cr: 0.10 to 0.28 wt%, Mo: 0.18 to 0.40 weight percent. Or, the high-carbon silicon manganese steel comprises a part of components in percentage by mass as follows: 0.84-1.15 wt%, Si: 0.52 to 0.78 wt%, Mn: 1.20-1.90 wt%, Cr: 0.08 to 0.20 wt%, Mo: 0.12 to 0.42 weight percent.
Example two
The present embodiment provides a method for manufacturing a large-scale high-carbon silicon manganese steel, please refer to fig. 1, the method includes:
step 110: the method comprises the steps of pouring molten steel in a steel ladle into a tundish in a protected mode, enabling the molten steel in the tundish to enter a crystallizer, and electromagnetically stirring the molten steel in a combined mode of the crystallizer, a casting flow and a tail end to obtain a continuous casting blank, wherein the continuous casting blank comprises the following components in percentage by mass: 0.60 to 1.20 wt%, Si: 0.38-0.80 wt%, Mn: 1.00-1.90 wt%, P: less than or equal to 0.020 wt%, S: less than or equal to 0.005 wt%, Al: 0.02-0.06 wt%, Nb: 0.02-0.05 wt%, Ti: 0.01 to 0.04 wt%, V: 0.025 to 0.065 wt%, Cr: 0.08 to 0.31 wt%, Mo: 0.10 to 0.50 weight percent, and the balance of Fe and inevitable impurities;
further, the tundish adopts a double-layer protective agent. Furthermore, the electromagnetic stirring current range of the crystallizer is 100-400A, and the frequency is 1-5 Hz. Furthermore, the electromagnetic stirring current range of the tail end is 800-1500A, and the frequency is 5-12 Hz. Further, the method for obtaining the continuous casting billet by using the crystallizer, the casting flow and the tail end combined type electromagnetic stirring of the molten steel comprises the following steps: pouring the molten steel stirred in the crystallizer by adopting a low superheat degree to obtain molten steel of a solidified shell; and regulating and controlling the throwing speed and the secondary cooling water specific water amount of the molten steel of the solidified blank shell to obtain the continuous casting blank. Further, the low superheat pouring temperature is 20-30 ℃. Further, the blank drawing speed is 0.2-0.7 m/min. Furthermore, the specific water amount of the secondary cooling water is 0.5-1.0L/kg. Further, the continuous casting blank is a large-section continuous casting blank, wherein the continuous casting blank has a specification of phi more than or equal to 600 mm.
Particularly, the large reduction amount and the sufficient compression ratio of a cogging mill are guaranteed for the continuous casting with the large section (phi 600mm and above), the internal quality of a rolled circle is guaranteed to meet the use requirements of users by combining the process characteristics of hot charging and hot delivery of the continuous casting and high-temperature slow cooling, and the steel ingot rolled circle product is partially replaced, so that the production cost is greatly reduced. When large-section (phi 600mm and above) high-carbon silicon manganese steel is produced by continuous casting, protective pouring is adopted from a steel ladle to a tundish, and the tundish uses a double-layer heat-insulating agent to prevent secondary oxidation of molten steel. And the molten steel of the tundish enters a crystallizer, the casting flow and the tail end are combined to electromagnetically stir, the electromagnetic stirring current range of the crystallizer is 100-400A, and the frequency is 1-5 Hz. The electromagnetic stirring current range of the tail end is 800-1500A, and the frequency is 5-12 Hz. Pouring the molten steel stirred in the crystallizer by adopting a low superheat degree to obtain molten steel of a solidified shell; and regulating and controlling the throwing speed and the secondary cooling water specific water amount of the molten steel of the solidified blank shell to obtain the continuous casting blank, wherein the low superheat degree pouring temperature is 20-30 ℃, the throwing speed is 0.2-0.7 m/min, and the secondary cooling water specific water amount is 0.5-1.0L/kg. The obtained continuous casting slab comprises the following components in percentage by mass: 0.60 to 1.20 wt%, Si: 0.38-0.80 wt%, Mn: 1.00-1.90 wt%, P: less than or equal to 0.020 wt%, S: less than or equal to 0.005 wt%, Al: 0.02-0.06 wt%, Nb: 0.02-0.05 wt%, Ti: 0.01 to 0.04 wt%, V: 0.025 to 0.065 wt%, Cr: 0.08 to 0.31 wt%, Mo: 0.10 to 0.50 wt%, and the balance of Fe and inevitable impurities.
Step 120: and (3) carrying the continuous casting blank to a heating furnace in a hot charging and hot conveying manner for heating, wherein the temperature of the continuous casting blank is 1200-1250 ℃ after heating is finished, and the heat preservation time is 5-8 h.
Further, the continuous casting billet is conveyed to a heating furnace at the hot charging temperature of 550-600 ℃. Further, the heating of the continuous casting billet is carried out by adopting a hot charging and hot feeding type, and the method comprises the following steps: the continuous casting billet is heated and divided into a preheating section, a first heating section, a second heating section and a soaking section, wherein the temperature of the preheating section is controlled to be 800-1000 ℃, the temperature of the first heating section is controlled to be 1001-1150 ℃, the temperature of the second heating section is controlled to be 1151-1220 ℃, and the temperature of the soaking section is controlled to be 1200-1250 ℃. Further, the total heating time of the continuous casting billet is 12-16 h. Further, the heat preservation time of the heating second section is 5-8 hours.
Specifically, the continuous casting billet is conveyed to a heating furnace for heating in a hot charging and hot conveying mode, wherein the hot charging temperature is 550-600 ℃, the problem of excessive cracking of the cold charging stress of the continuous casting billet can be avoided, the total heating time can be reduced, and energy can be saved. For control continuous casting billet heating temperature, heating in the heating furnace the continuous casting billet heating divide into preheating section, heating one section, heating two-stage process, soaking section, the total heat time of continuous casting billet heating is 12 ~ 16h, and wherein, preheating section temperature control is 800 ~ 1000 ℃, the control of heating one section temperature is 1001 ~ 1150 ℃, the control of heating two-stage process temperature is 1151 ~ 1220 ℃, the control of soaking section temperature is 1200 ~ 1250 ℃. Namely, the temperature of the continuous casting slab after heating is 1200-1250 ℃, and the heat preservation time is 5-8 h. The heat preservation time of the heating second section is also 5-8 hours, so that the core temperature of the casting blank is the same as the surface temperature, and the single-pass large reduction of the cogging mill is convenient to realize. Meanwhile, the problems that the heating time is too long, the energy consumption is high, and the surface of the bearing steel is seriously decarburized easily due to long-time heating are solved.
Step 130: and rolling the heated continuous casting plate blank by using a cogging mill to obtain square steel, and obtaining the large-size high-carbon silicon-manganese steel by using 4-6 continuous rolling units for the square steel.
Further, the heated continuous casting plate blank is rolled by a cogging mill in the middle pass by 3-4 passes with the reduction of 110-130 mm to obtain the square steel. Furthermore, the specification of the square steel is 270 multiplied by 270-430 multiplied by 430 mm. Furthermore, the specification of the large-specification high-carbon silicon-manganese steel is round steel.
Specifically, the rolling reduction of the heated continuous casting slabs with different section sizes in the middle pass is 110-130 mm by using a cogging mill for 3-4 passes, the continuous casting slabs are rolled into square steel with the thickness of 270 x 270-430 x 430mm by using the cogging mill, and the large-size high-carbon silicon manganese steel, namely the large-size round steel required by rolling, is obtained by using 4-6 continuous rolling units for the square steel.
Step 140: and (3) performing high-temperature pit entry and slow cooling on the large-size high-carbon silicon manganese steel after rolling, wherein the pit entry temperature is 650-720 ℃, and the pit exit temperature is 25-150 ℃.
Further, the slow cooling time for carrying out high-temperature pit entering and slow cooling on the large-size high-carbon silicon manganese steel after rolling is 72-96 hours.
Specifically, the rolled large-size high-carbon silicon-manganese steel is subjected to high-temperature pit entry and slow cooling, wherein the pit entry temperature is 650-720 ℃, the slow cooling time is 72-96 h, the pit exit temperature is 25-150 ℃, the ultrasonic flaw detection is carried out on round steel according to the standard C grade of GB/T4162 plus 2008 'forged and rolled steel bar ultrasonic detection method', and the flaw detection qualification rate is more than 95%.
EXAMPLE III
The embodiment provides a method for manufacturing large-size high-carbon silicon-manganese steel, which is applied to a certain large-size steel mill, and comprises the following steps:
when the tool steel 8MnSi with the specification of phi 800mm is produced by smelting and continuous casting in an electric furnace, in order to avoid secondary oxidation of molten steel, protective pouring is adopted from a steel ladle to a tundish, and the tundish uses a double-layer heat insulating agent; a crystallizer, a casting flow and a tail end are combined to carry out electromagnetic stirring, wherein the electromagnetic stirring current of the crystallizer is 90A, the frequency is 2Hz, the electromagnetic stirring current of the casting flow is 100A, the frequency is 4Hz, and the electromagnetic stirring current of the tail end is 900A, the frequency is 5 Hz; the low superheat degree pouring in the crystallizer is 25 ℃; the blank drawing speed in the crystallizer is controlled to be 0.3 m/min; the specific water amount of the secondary cooling water is 0.7L/kg.
And the continuous casting billet is conveyed to a heating furnace for heating in a hot charging and hot conveying mode, and the hot charging temperature is 580 ℃. The continuous casting billet with the phi 800mm specification is heated in a heating furnace, and the temperature of each section is controlled as follows: the preheating section is 750 ℃, the first heating section is 1140 ℃, the second heating section is 1180 ℃ and the soaking section is 1190 ℃. And the heat preservation time of the continuous casting billet in the heating second section and the soaking section is 6 hours, and the total heating time is 14 hours, so that the core temperature and the surface temperature of the continuous casting billet are basically the same.
And 4-pass reduction of 110-130 mm is realized in the middle pass of the rolling process of the cogging mill, the continuous casting billet is rolled into 310 x 310mm by the cogging mill to obtain square steel, and then the square steel is rolled into round steel with the phi 250mm specification by a 4-frame continuous rolling unit.
And (3) performing high-temperature pit entry slow cooling on the rolled round steel at 660 ℃, wherein the slow cooling time is 72h, the pit exit temperature is 120 ℃, and obtaining the high-carbon silicon-manganese steel with the phi of 800 mm.
The technical scheme provided in the embodiment of the application at least has the following technical effects or advantages:
the embodiment of the invention provides large-size high-carbon silicon-manganese steel and a manufacturing method thereof, wherein molten steel in a steel ladle is poured into a tundish in a protective mode, the molten steel in the tundish enters a crystallizer, the molten steel is electromagnetically stirred by the crystallizer, a casting flow and a tail end in a combined mode to obtain a continuous casting blank, and the continuous casting blank comprises the following components in percentage by mass: 0.60 to 1.20 wt%, Si: 0.38-0.80 wt%, Mn: 1.00-1.90 wt%, P: less than or equal to 0.020 wt%, S: less than or equal to 0.005 wt%, Al: 0.02-0.06 wt%, Nb: 0.020 to 0.050 wt%, Ti: 0.01 to 0.04 wt%, V: 0.025 to 0.065 wt%, Cr: 0.08 to 0.31 wt%, Mo: 0.10 to 0.50 weight percent, and the balance of Fe and inevitable impurities; conveying the continuous casting blank to a heating furnace in a hot charging and hot conveying manner for heating, wherein the temperature of the continuous casting blank is 1200-1250 ℃ after heating is finished, and the heat preservation time is 5-8 h; rolling the heated continuous casting plate blank by using a cogging mill to obtain square steel, and obtaining large-size high-carbon silicon-manganese steel by using 4-6 continuous rolling mill sets for the square steel; and (3) performing high-temperature pit entry and slow cooling on the large-size high-carbon silicon manganese steel after rolling, wherein the pit entry temperature is 650-720 ℃, and the pit exit temperature is 25-150 ℃. The technical problem that the quality of the center of the produced large-size high-carbon silicon manganese steel is poor due to the fact that the production capacity of a large section of a continuous casting billet is limited in the prior art and the defects of shrinkage and looseness in the continuous casting billet cannot be effectively welded due to small rolling is solved by adopting a hot charging hot delivery, large rolling reduction of a cogging mill and high-temperature slow cooling, continuous casting production of the large-size high-carbon silicon manganese steel is achieved, the shrinkage in the continuous casting billet is successfully welded, the inner looseness is greatly improved, the low-power central looseness, the general looseness and ingot type segregation of the large-size high-carbon silicon manganese steel are less than or equal to 1.5 grade, the defects of residual shrinkage and cracks do not exist in the low-power cross section, and the qualification rate is over 95%.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to encompass such modifications and variations.
Claims (21)
1. The large-size high-carbon silicon-manganese steel is characterized by comprising the following components in percentage by mass: 0.60 to 1.20 wt%, Si: 0.38-0.80 wt%, Mn: 1.00-1.90 wt%, P: less than or equal to 0.020 wt%, S: less than or equal to 0.005 wt%, Al: 0.02-0.06 wt%, Nb: 0.020 to 0.050 wt%, Ti: 0.01 to 0.04 wt%, V: 0.025 to 0.065 wt%, Cr: 0.08 to 0.31 wt%, Mo: 0.10 to 0.50 wt%, and the balance of Fe and inevitable impurities.
2. The large-gauge high-carbon silicomanganese steel according to claim 1, wherein a portion of the high-carbon silicomanganese steel comprises, in mass percent, C: 0.80-1.20 wt%, Si: 0.50-0.80 wt%, Mn: 1.00-1.50 wt%, Cr: 0.15 to 0.30 wt%, Mo: 0.10 to 0.35 weight percent.
3. The large-gauge high-carbon silicomanganese steel according to claim 1, wherein a portion of the high-carbon silicomanganese steel comprises, in mass percent, C: 0.65-1.00 wt%, Si: 0.40-0.65 wt%, Mn: 1.15-1.45 wt%, Cr: 0.10 to 0.28 wt%, Mo: 0.18 to 0.40 weight percent.
4. The large-gauge high-carbon silicomanganese steel according to claim 1, wherein a portion of the high-carbon silicomanganese steel comprises, in mass percent, C: 0.84-1.15 wt%, Si: 0.52 to 0.78 wt%, Mn: 1.20-1.90 wt%, Cr: 0.08 to 0.20 wt%, Mo: 0.12 to 0.42 weight percent.
5. The method is characterized in that molten steel in a ladle is poured into a tundish in a protective mode, the molten steel in the tundish enters a crystallizer, the crystallizer, a casting flow and a tail end are combined to electromagnetically stir the molten steel to obtain a continuous casting blank, and the continuous casting blank comprises the following components in percentage by mass: 0.60 to 1.20 wt%, Si: 0.38-0.80 wt%, Mn: 1.00-1.90 wt%, P: less than or equal to 0.020 wt%, S: less than or equal to 0.005 wt%, Al: 0.02-0.06 wt%, Nb: 0.020 to 0.050 wt%, Ti: 0.01 to 0.04 wt%, V: 0.025 to 0.065 wt%, Cr: 0.08 to 0.31 wt%, Mo: 0.10 to 0.50 weight percent, and the balance of Fe and inevitable impurities;
conveying the continuous casting blank to a heating furnace in a hot charging and hot conveying manner for heating, wherein the temperature of the continuous casting blank is 1200-1250 ℃ after heating is finished, and the heat preservation time is 5-8 h;
rolling the heated continuous casting plate blank by using a cogging mill to obtain square steel, and obtaining large-size high-carbon silicon-manganese steel by using 4-6 continuous rolling mill sets for the square steel;
and (3) performing high-temperature pit entry and slow cooling on the large-size high-carbon silicon manganese steel after rolling, wherein the pit entry temperature is 650-720 ℃, and the pit exit temperature is 25-150 ℃.
6. The large format high carbon silicomanganese steel of claim 5, wherein said tundish is coated with a bilayer of protective agent.
7. The large-sized high-carbon silicon-manganese steel according to claim 5, wherein the electromagnetic stirring current of the crystallizer is in the range of 100-400A, and the frequency is 1-5 Hz.
8. The large-sized high-carbon silicon-manganese steel according to claim 5, wherein the electromagnetic stirring current at the tail end is 800-1500A, and the frequency is 5-12 Hz.
9. The large-size high-carbon silicomanganese steel according to claim 5, wherein said obtaining of a slab by electromagnetic stirring of said molten steel with said combined crystallizer, casting and end-of-line stirring comprises:
pouring the molten steel stirred in the crystallizer by adopting a low superheat degree to obtain molten steel of a solidified shell;
and regulating and controlling the throwing speed and the secondary cooling water specific water amount of the molten steel of the solidified blank shell to obtain the continuous casting blank.
10. The large-gauge high-carbon silicomanganese steel according to claim 9, wherein the low superheat pour temperature is 20 to 30 ℃.
11. The large-gauge high-carbon silicomanganese steel according to claim 9, wherein the withdrawal speed is 0.2 to 0.7 m/min.
12. The large-size high-carbon silicon-manganese steel according to claim 9, wherein the specific water amount of the secondary cooling water is 0.5-1.0L/kg.
13. The large-specification high-carbon silicon manganese steel according to claim 5, wherein the continuous casting slab is a large-section continuous casting slab, and the specification of the continuous casting slab is phi is more than or equal to 600 mm.
14. The large-specification high-carbon silicon-manganese steel according to claim 5, wherein the slab is conveyed to the heating furnace at a hot charging temperature of 550 ℃ to 600 ℃.
15. The large format high carbon silicomanganese steel of claim 5, wherein said hot charging and hot feeding of said slab to a furnace for heating comprises:
the continuous casting billet is heated and divided into a preheating section, a first heating section, a second heating section and a soaking section, wherein the temperature of the preheating section is controlled to be 800-1000 ℃, the temperature of the first heating section is controlled to be 1001-1150 ℃, the temperature of the second heating section is controlled to be 1151-1220 ℃, and the temperature of the soaking section is controlled to be 1200-1250 ℃.
16. The large-specification high-carbon silicon-manganese steel according to claim 15, wherein the total heating time of the continuous casting slab is 12-16 h.
17. The large-specification high-carbon silicon-manganese steel according to claim 15, wherein the holding time of the second heating section is 5-8 h.
18. The large-size high-carbon silicon-manganese steel according to claim 5, wherein the heated continuous cast slab is rolled by a cogging mill in an intermediate pass with a reduction of 3-4 passes of 110-130 mm to obtain a square steel.
19. The large-gauge high-carbon silicon-manganese steel according to claim 5, wherein the gauge of the square steel is 270 x 270 to 430 x 430 mm.
20. The large format high carbon silicomanganese steel of claim 5, wherein the large format high carbon silicomanganese steel is of round steel gauge.
21. The large-size high-carbon silicon-manganese steel according to claim 5, wherein the slow cooling time for performing high-temperature pit entering slow cooling on the large-size high-carbon silicon-manganese steel which is subjected to rolling is 72-96 h.
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